Can't download notebook (400 : Bad Request)

[christianbrodbeck]

When I try to download a notebook as another format (e.g. HTML) I get the error page below (400 : Bad Request -- 'str' object has no attribute 'metadata'). It seems to be specifically related to jupytext:

• If I create a very simple notebook and download it, that works as expected
• If I then turn on Jupytext/Pair notebook ... and try to download again I get the error
• If I then Jupytext/Unpair notebook the error still happens

I could not find anything related to that error. I am relatively new to Jupyter, is there a way to get a traceback for that error? My system is:

• MacOS
• jupyter-1.0.0 (conda-forge)
• jupytext-1.2.1

[mwouts]

Hello @christianbrodbeck , thank you for reporting this.

The closest related issue is #118, but yours seems a bit different.

I will have a look when I come back, in one week. Meanwhile you may want to test if the same issue occurs on Binder (give a try with get_started.ipynb at https://mybinder.org/v2/gh/mwouts/jupytext/master/demo).

[christianbrodbeck]

Thanks @mwouts ! I could not reproduce the issue on Binder. Some further investigation suggests that the error is related to this line in jupyter_notebook_config.py:

c.ContentsManager.notebook_extensions = "ipynb"

The error occurs only when the line is active, and does not occur when it is commented.

[mwouts]

Oh thank you for that precision, it helped me a lot to debug the issue. I have been able to reproduce and fix it.

[christianbrodbeck]

Great, thanks!